 |
|
|
|
|
 |
High Quality Metallurgical Coke  If you are searching for a source of high quality metallurgical coke with :
Look no further. You'll find it at Acme Steel Coke Plant!
Coal is used to make coke for the iron and steel industry, foundries, and other industries. The presence of large domestic deposits of coking coal, or metallurgical coal, played an important role in the development of the U.S. iron and steel industry. Coke is used chiefly to smelt iron ore and other iron bearing materials in blast furnaces, acting both as a source of heat and as a chemical reducing agent, to produce pig iron, or hot metal. Coke, iron ore, and limestone are fed into the blast furnace, which runs continuously. Hot air blown into the furnace burns the coke, which serves as a source of heat and as an oxygen reducing agent to produce metallic iron. Limestone acts as a flux and also combines with impurities to form slag. Coke also serves as a structural material to support the deep bed of coke/iron oxides/limestone that makes up much of the furnace volume. It is in this last role that its properties are crucial. It is important that the it does not degrade (e.g., break up into small particles) during its descent through the oxidizing hot gases passing upward through the stack region of the furnace. To produce high quality blast furnace coke, high quality
coals must be used. High quality coals are those coals that, when coked together, produce
the highest "stability" and CSR (coke strength after reactivity) to support the
blast furnace burden and allow maximum wind for maximum production. Traditionally, chemistry, size, and strength have been considered the most important properties for use in the blast furnace. However, nowadays coke reaction with carbon dioxide and its strength after reaction are even more important. Coke reactivity affects furnace operating parameters such as fuel rate, furnace permeability, and hot metal production. As a result of major changes in blast furnace design and operating parameters, such as PCI, coke rates to the blast furnace have dropped below 700 lbs./ton of hot metal. Thus, the need for strong and consistent properties has become more important than ever. Highly reactive coke may become substantially weakened so that it cannot properly support the burden during its descent in the blast furnace. By the time it works its way to the high-temperature combustion zone, or raceway, the coke may become so weak that it causes major upsets to occur in raceway performance. Poor raceway behavior restricts gas and liquid permeability in the blast furnace, reducing overall furnace efficiency. These properties can be readily traced to the parent coals making up the blend composition. The quality of the constituent coals determine the characteristics of the resultant coke. It has been shown that coke with isotropic texture derived from weakly-coking high volatile coal is chemically weak and easily attacked by the gasification reaction with carbon dioxide. Better coking high and medium volatile coals produce coarse circular and lenticular carbon forms with lower reactivity. Coke petrography is the main tool to reveal the carbon textures as well as the coke microstructure. Coke microstructure deals with the amount and size of pores and walls, porosity, and quality of binding. Carbon textures and microstructure are two main factors that affect the reactivity, stability, and the coke strength after reaction. In addition to properties of carbon texture and structure,
another factor that affects reactivity is the composition of the ash (or mineral
matter). For example, the presence of alkalies and iron can lead to an increased
rate of reaction with carbon dioxide. At Acme Steel Coke Plant, you'll discover an information packed web site that features a plant that produces high quality metallurgical coke. Click here to request a quote
For Information about our Products Contact:
|
